William d



(No Model.)

W. D. GRAY.

RULLBR GRINDING MILL.

No. 339,163. I Patented Apr. 6, 1886.

.Iggy

Mill

UNITED STATES PATENT OFFICE.

VILLIAM D. GRAY, OF MILVAUKEE, WISCONSIN, ASSIGNOR TO E. I?. ALLIS d: CO., OF SAME PLACE.

ROLLER GRlNDING-MILL.

SPECIFICATION forming part of Letters Patent No. 339,163, dated April 6,1886.

Serial No. 138,779. (Numodel.)

To all whom, it may concern,.-

Be it known that I, WILLIAM D. GRAY, of Milwaukee, in the county of Milwaukee and State of Viseonsin, have invented certain Improvements in Roller Grinding-Mills, of which the following is a specification.

This invention has reference to those grinding-mills in which one ofthe two grinding-rolls is movable at will away from its companion to lo stop the grinding action,and in which the material is delivered from the hopper to the grinding-rolls by means of an intermediate feed-roll.

The invention relates to an improved conr 5 struction of parts to effect the separation ofthe grinding-rolls and the stoppage of the feedroll at one operatiomand also to improvements in the feed devices.

The improvements are applicable to mills 2o containing a single pair of feed-rolls, and also to those containing two pairs; but it is deemed sufficient to illustrate herein a mill of the firstnamed character.

Referring to the drawings, Figure l is an end elevation of a mill having my improvements embodied therein, a portion of thehopper being broken away to expose the internal parts to view. Fig. 2 is a side elevation ofthe principal portions of the same. Fig. 3 is alongitudinal vertical section through one end of the feed-roll and the attendant parts. Fig. 4 is a cross-section on the line m x of Fig. 3.

Referring to the accompanying drawings,A represents the main frame, B a horizontal grinding-roll mounted in fxedbearings on the frame, and O the companion roll mounted in arms or supports D, which are pivoted at their lower ends,in order that they may swing forward and backward to move the roll C to and 4o from its companion. The respective roll-supporting arms I) are connected at their upper ends by adjustable devices to rods E, which are extended across the top of the machine and mounted at their opposite ends on eccentrics F,

secured on a horizontal rock-shaft, G,supported in xed bearings. The rock-shaft has secured upon one end a crank arm or lever, H,which is pivoted to one end of a rod, I, provided with a handle at its end,in the manner represented 5o in Fig. 1, so that by moving the rod I in one direction it is caused, through the intermediate parts, to separate the grinding-rolls, and thus stop the grinding action, while by moving the rod in the opposite direction the rolls are brought together in proper relation to reduce the material passing between them. On the top of the machine I mount, as usual, a feedhopper, S, and at the lower end or throat of this hopper I mount in fixed bearings a feedroll, T, the office of which is to deliver the ma- 6o terial from the hopper gradually and in a continuous stream to the grinding-rolls beneath. As shown in Fig. 3, the feed-roll has on one end a long journal or shaft, which is extended outward through the side of the hopper anda stationary sleeve thereon. At its outerl end the shaft is provided with a driving-pulley,K, arranged to turn loosely thereon, but prevented from moving laterally either by means of a screw, a, entering a groove in the shaft, as 7o shown, or by other suitable means. There is also mounted on the shaft of the feed-roll, adjacent to the driving-pulley, a sleeve or clutch,

L, connected to the shaft by means of a screw and slot, as shown, in order that it may play endwise thereon, although compelled to rotate therewith. lThe outer end of this sleeve is toothed or serrated to engage with corresponding teeth or serrations on the hub ofthe driving-pulley, which remains constantly in So motion. When, therefore, the sleeve is moved outward into engagement with the wheel, motion is communicated from the wheel through the sleeve to the feed-roll; but upon moving the sleeve inward or out of engagement the feed-roll is permitted to stop, imtwithstamling the continued rotation of the wheel'.

For the purpose of holding the driving-pulley normallyin engagement-,and of causingits automatic re-engagement when released, aspi- 9o ral spring, M, is applied around the shaft of the feed-roll, with one end seated against the sleeve and the opposite end seated against the collar, supported by a pin or otherwiseon the roll-shaft.

For the purpose of disengaging the d riving-sleeve, I provide an external sleeve,N,one end of which encircles the driving-sleeve,while the opposite end encirclcs the stationary hub or sleeve J, bolted to the side of the hopper. ico At one end this sleeve N is provided with a screw, Z), which enters acircumibrential groove formed in the driving-sleeve, this connection constituting a swiveling joint, permittingthe driving-sleeve to rotate independently, but compelling it to move endwise with the sleeve N. At the opposite end the sleeve N is provided with an internal groove, c, having a spiral 0r inclined face, which acts against a stationary stud, d, on the side of the fixed sleeve J. On turning the sleeve N in one direction, the stud acting against the side ofthe inclined groove causes the sleeve to be moved endwise to the right, whereby it is caused in turn to move the driving-sleeve L out of engagement with the driving-pulley. 1When, however, the sleeve N is rotated in the opposite direction, it is permitted to move to the left, so that the spring may throw the driving-sleeve into engagement. rlhe rotation of the sleeve Nis effected by means of abar or link, O, one end of which is pivoted to an arm, 1., on the sleeve N, While the opposite end is pivoted to the crank-arm II, by which the adjustment of the rolls iseffected,asbeforedescribed. Asshown in the drawings, the arrangement is such that as the rolls are spread apart the feeddriving clutch is disengaged, and vice versa. In otl1- er words, the opening or spreading apart of the rolls is accompanied by the stoppage of the feed-ro1l,and the closing together of the grinding-rolls is accompanied by the starting of the feed-roll.

I am aware that means have hitherto been devised for controlling the grinding-rolls and the feed-rolls simultaneously, and the present invention is therefore restricted to the iinproved construction and arrangement of parts herein described to that end and claimed.

Having thus described my invention,what I claim is- 1. In a grinding-mill,the combination of two grinding rolls, roll-adjusting mechanism, a hopper, a feed-roll, a driving pulley and clutch on the feed-roll shaft, the rotatable longitndinally-movable sleeve, as described, encircling the shaft to control the clutch, and a connection between said sleeve and the roll-adjusting mechanism. v

2. In a grinding-mill, the grinding-rolls, the hopper, the feed-roll; the driving pulley and clutch on the feed-roll shaft,and the spring,in combination with the fixed support .I and the encircling-sleeve N,siviveled to the clutch and connected with said iixed support J by a pin and spiral slot, substantially as described, whereby the rotation of thel sleeve is caused to control the action ofthe clutch.

RICHARD Herrin, RICHARD BIRKHOLZ. 

